Malicious PDF — malware analysis report

Static analysis result for SHA-256 499e4488ee2bf722…

MALICIOUS

PDF

46.3 KB Created: 2020-08-31 06:06:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e731f999d2d97426082fb36ed9bf76da SHA-1: fc6daca45c2ea70cc71c42c6764ffdafc8d6eea7 SHA-256: 499e4488ee2bf7224196d02bd46e7c4452d57b0a08a84a9bfd2dcd8518d71d24
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'English grammar worksheets for grade 12 pdf', suggesting a lure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms the malicious nature of the redirector URL. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/wix?keyword=english+grammar+worksheets+for+grade+12+pdf
    • https://cdn.shopify.com/s/files/1/0436/4497/7305/files/nasum.pdf
    • https://cdn.shopify.com/s/files/1/0430/7091/4717/files/1481946476.pdf
    • https://cdn.shopify.com/s/files/1/0431/3019/2039/files/52583609445.pdf
    • https://cdn.shopify.com/s/files/1/0430/4073/5381/files/canon_scanner_lide_120_specification.pdf
    • https://cdn.shopify.com/s/files/1/0430/8297/3346/files/mafirizegudemejuzufe.pdf
    • https://cdn.shopify.com/s/files/1/0434/5259/6374/files/newit.pdf
    • https://cdn.shopify.com/s/files/1/0440/8170/9206/files/folokid.pdf
    • https://cdn.shopify.com/s/files/1/0433/6166/5192/files/escape_room_level_113_answer_explanation.pdf
    • https://cdn.shopify.com/s/files/1/0451/8169/8199/files/34437060487.pdf
    • https://cdn.shopify.com/s/files/1/0459/1462/0053/files/water_cycle_worksheet_9th_grade.pdf
    • https://cdn.shopify.com/s/files/1/0440/1030/7749/files/riviwi.pdf
    • https://cdn.shopify.com/s/files/1/0434/4833/6536/files/dagedobaxubizugegusamuvem.pdf
    • https://cdn.shopify.com/s/files/1/0435/5837/1496/files/dikikubikogo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7870/4536/files/sociologia_da_educao_alberto_tosi.pdf
    • https://static.usrfiles.com/ugd/b8c837_e3992d0452ce447a8d383308d10d8727.pdf
    • https://static.usrfiles.com/ugd/0049ca_c4126b8a2cc540d1a86590b63b1d67ef.pdf
    • https://static.usrfiles.com/ugd/9e41f0_7a40d2e8e5f84dfbbaa9b733e7a1aed1.pdf
    • https://static.usrfiles.com/ugd/b8c837_0c43ab42b40f4f7a892d247be19dfa8a.pdf
    • https://static.usrfiles.com/ugd/b6edda_ab7463ed33c6474781be1d31ffe92713.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007195.bin
b57facbe504623e5b90fdf1b326ef740811b46b104cacb893b241b06c1ed9f0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7195 5752 bytes
font_01_sfnt_off00008518.bin
d3db831d0aaead8ad6ac13443f8254e77d7a22bfd5f5f499ecac8b440f13091b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8518 11684 bytes

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